Improved adjustable hollow drill



initrd istrt CHARLES E. BUTLER, OF HUDSON, NEWv YORK.

Letters PatcntNo.102,090, elatedl April 19, 1870.

IMPROVED AJJUSTABLE HOLLOW DRILII.

The Schedule referred to in these Letten Patent and making part of the same.

l, CHARLES E. BUTLER, of the city of Hudson, in the county of Columbia and State of New York, have invented certain improvements in the so-called selfcenteling chuck of E. B. Beach, patented September 6, 1864, by which 'it is converted into an Adjustable Hollow Drill and Burrer.

The nature of my invention consists in making the sliding jaws of this chuck cutting instead of clamping-jaws, the object being to employ it not as a clutch or chuck for holding tools to be operated with, nor for holding the article or subst-ance to be worked upon, but to be itself used as and for an adj ustable hollow drill.

Description of the Accompanying Drawings. Figure l is a perspective view of the hollow drill. Figure 2 is a. longitdinal section of the same. Figure 3 is a view of the head or cutting-end of' the jaws.

Figure 4 is a side "iew of one of the cutter-jaws detached.

-which extends a little below the inner edge or plane of the jaws. This form of cutter cuts smoothly and leaves a square shoulder. i

Other forms of cutters may be employed for cutting tapers, or for leaving a beveled shoulder, or for forming a beveled or male center. The kind of work required to be done will readily suggest the form of cutter necessary to accomplish it.

The mandrel B of the drill is employed to regulate the size of the pivot, shaft, or pin it is desired to cut by expanding or contracting the cutter a a a and, by means' of the check-nut C and thread on the mandrel at the base of drill, the cutter-jaws are secured at any point of expansion or contraction required. Without this nut O the jaws are liable, when cutting hard metals, to slide,and thus to vary the size of the journal, pin, shaft, or other article being cut. This, therefore, becomes not only import-ant, but a necessity' in making this instrument an adjustable hollow drill. v

I am aware, as before4 stated, thatl a patent has been granted to Edgar B. Beach for what he terms an improved self-centering chuck, which is constructed generally as I propose to construct my adjustable hollow drill. I do not, however, claim any part of his invention; but

What I do claim as my invention, and desire to secure by Letters Patent, is-

1. 'lhe cutting-lips on the ends of the jaws, as and I for the purpose set forth.

2. The combination of the conical shell A, cuttingjaws a ala, mandrelv B, and check-nut C, as and for the purpose set forth.

CHAS. E. BUTLER.

Witnesses:

ALEX. S.R0WLEY, WHEELER H. CLARKE. 

